Determine the filename of an open file by the fd

#include <sys/param.h> #include <sys/pstat.h> #include <sys/unistd.h> #include <stdio.h> int main( int argc, char *argv[] ) { #define BURST ((size_t)10) struct pst_fileinfo2 psf[BURST]; int i, count; int idx = 0; /* index within the context */ if ( argc != 2 ) { printf( "args: <pid>\n" ); exit( 1 ); } pid_t target = atoi( argv[1] ); (void)printf("Open files for process PID %d\n", target); /* loop until all fetched */ while ((count = pstat_getfile2(psf, sizeof(struct pst_fileinfo2), BURST, idx, target)) > 0) { /* process them (max of BURST) at a time */ for (i = 0; i < count; i++) { (void)printf("fd #%d\tFSid %x:%x\tfileid %d\n", psf[i].psf_fd, psf[i].psf_id.psf_fsid.psfs_id, psf[i].psf_id.psf_fsid.psfs_type, psf[i].psf_id.psf_fileid); } /* * Now go back and do it again, using the * next index after the current 'burst' */ idx = psf[count-1].psf_fd + 1; } if (count == -1) perror("pstat_getfile2()"); #undef BURST }

#include <unistd.h> char *ttyname(int fildes);